I bought it for single burning. The product is satisfied. However, because there was something that was broken, I made four evaluations. I think that it probably was damaged at the time of delivery. Also, as I needed it in a hurry, I did not apply for replacement.

Since it is not the original use of the test tube, it is not easy to write an opinion, but the tube for single-violet disposal is thin and short, so the water runs out soon, so it's not well known. This is very good, as you can ensure enough water.